121252115143421 has 16 divisors (see below), whose sum is σ = 123369842308800. Its totient is φ = 119146885925760.

The previous prime is 121252115143391. The next prime is 121252115143463. The reversal of 121252115143421 is 124341511252121.

It is a cyclic number.

It is not a de Polignac number, because 121252115143421 - 2¹⁰ = 121252115142397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121252115143121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113734355 + ... + 114795503.

It is an arithmetic number, because the mean of its divisors is an integer number (7710615144300).

Almost surely, 2^{121252115143421} is an apocalyptic number.

It is an amenable number.

121252115143421 is a deficient number, since it is larger than the sum of its proper divisors (2117727165379).

121252115143421 is a wasteful number, since it uses less digits than its factorization.

121252115143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067036.

The product of its digits is 19200, while the sum is 35.

Adding to 121252115143421 its reverse (124341511252121), we get a palindrome (245593626395542).

The spelling of 121252115143421 in words is "one hundred twenty-one trillion, two hundred fifty-two billion, one hundred fifteen million, one hundred forty-three thousand, four hundred twenty-one".